Geometry Vocabulary
Presentation
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Mathematics
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7th Grade
•
Easy
+3
Standards-aligned
Lucia Jimenez
Used 77+ times
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14 Slides • 10 Questions
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Geometry Vocabulary
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Angle
An angle is a combination of two rays (half-lines) with a common endpoint. The latter is known as the vertex of the angle and the rays as the sides, sometimes as the legs and sometimes the arms of the angle
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Open Ended
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Right Angle
An angle of 90°, as in a corner of a square or at the intersection of two perpendicular straight lines.
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Multiple Choice
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Acute
Acute angles measure less than 90 degrees.
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Open Ended
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Obtuse Angle
An obtuse angle has a measurement greater than 90 degrees but less than 180 degrees.
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Multiple Choice
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Straight Angle
An angle of 180°
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Open Ended
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Complementray Angle
An angle that is either of two angles whose sum is 90°.
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Open Ended
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Supplementray Angle
either of two angles whose sum is 180°.
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Multiple Choice
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Side- Side-Side Rule
Side-Side-Side is a rule used to prove whether a given set of triangles are congruent.
The SSS rule states that: If three sides of one triangle are equal to three sides of another triangle, then the triangles are congruent.
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Additional Side-Side-Side rule (SSS)
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Open Ended
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Congruent
Two angles are congruent if they have the same measure.
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Open Ended
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Polygon
A plane shape (two-dimensional) with straight sides.
Examples: triangles, rectangles and pentagons.
(Note: a circle is not a polygon because it has a curved side)
See: Plane Shape
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Open Ended
Geometry Vocabulary
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